All things related to multicast

[Marshall Eubanks <>]

Is the receiver behind the Cisco and the source behind the HP ?

60 seconds is the default PIM  Period between Join/Prune Messages  
(http://www.faqs.org/rfcs/rfc4601.html - section 4.11). It sounds  
from the discription below that the HP is doing the right thing (what  
it is told to do).

Is the CISCO running IGMP v2 ?

This might just be an bug, but I doubt it. It is as if the Cisco is  
getting an IGMP leave message and not receiving the proper response  
to its Last Member Query.

Can you get a better dump of the IGMP traffic. Is it possible that  
IGMP traffic is not being done correctly - for example, that the  
VLANs are an NBMA network ? That will cause false time outs.

Have you tried the test with 2 Ciscos and then with 2 HPs ?

Regards
Marshall

On Sep 21, 2007, at 10:55 AM, Yuri Kolomiyets wrote:

> Hi All,
>
> We're having some troubles with PIM between Cisco and HP.  
> Everything works fine, except any stream freezes for 1 second every  
> minute. We traced it back to the periodic join/prune updates coming  
> from HP which contain a (S,G) prune for the active stream. Then 1  
> second later the HP sends a join for the same (S,G).
> Here's debug from the cisco side:
>
> *Mar  4 00:21:49.849: PIM(0): Received v2 Join/Prune on  
> GigabitEthernet1/0/24 from 10.0.0.2, to us
> *Mar  4 00:21:49.849: PIM(0): Join-list: (*, 239.255.100.100), RPT- 
> bit set, WC-bit set, S-bit set
> *Mar  4 00:21:49.849: PIM(0): Update GigabitEthernet1/0/24/10.0.0.2  
> to (*, 239.255.100.100), Forward state, by PIM *G Join
> *Mar  4 00:21:49.849: PIM(0): Prune-list: (10.0.3.2/32,  
> 239.255.100.100) RPT-bit set
> *Mar  4 00:21:49.849: PIM(0): Prune  
> GigabitEthernet1/0/24/239.255.100.100 from (10.0.3.2/32,  
> 239.255.100.100) - deleted
> *Mar  4 00:21:50.848: PIM(0): Received v2 Join/Prune on  
> GigabitEthernet1/0/24 from 10.0.0.2, to us
> *Mar  4 00:21:50.848: PIM(0): Join-list: (10.0.3.2/32,  
> 239.255.100.100), S-bit set
> *Mar  4 00:21:50.848: PIM(0): Add GigabitEthernet1/0/24/10.0.0.2 to  
> (10.0.3.2, 239.255.100.100), Forward state, by PIM SG Jon
>
>
> This is happening in our production network, as well as a little  
> lab we set up to test this. The lab setup is a 3750 Cisco and a  
> 3500 HP with 2 laptops connected to each switch. If anyone  
> interested in the lab configs, I posted them here:
> http://ist.uwaterloo.ca/~ykolomiy/multicast-lab-configs.txt
>
> If anyone has any idea why this might be happening and what we can  
> do to fix it, we'd really appreciate it.
>
> Thanks a lot,
>
> Yuri Kolomiyets
>
> Network Services
> Information Systems & Technology
> University of Waterloo
>
> E-mail: 
>
> Phone: (519) 888-4567 x36999